进程同步 吃水果问题

[xxy880926]

模拟吃水果的同步模型：桌子上有一只盘子，最多可容纳两个水果，每次只能放入或者取出一个水果。爸爸专门向盘子中放苹果，妈妈专门向盘子中放橘子，两个儿子专门等待吃盘子中的橘子，两个女儿专门等吃盘子中的苹果。
使用C++实现

[BuleRiver]

多线程实现，建议LZ参考理发师问题

[o46382509]

PV操作问题！操作系统上有些源代码你可以参考下！

[zhuxueling]

//
// fruit.cpp
// ~~~~~~~~~~~~~~~~
// 
// @author <[e-mail]>
// @data   2009-02-09

#include <string>
#include <iostream>
#include "Thread.hpp"

using namespace Traxex;

enum Fruit{ None, Apple, Orange};

class Plate{
public:
    void add( std::string name, Fruit f){
	while( true){
	    c_eat.wait();
	    std::cout << name << "\tadd\t";
	    if( f == Apple){ 
		std::cout << "an Apple\n"; c_apple.signal(); Sleep( 1);
	    }else{
		std::cout << "an Orange\n";c_orange.signal(); Sleep( 0.8);
	    }

	}
	    
    }
    void eat( std::string name, Fruit f){
	while( true){
	    if( f == Apple) c_apple.wait();
	    else            c_orange.wait();

	    std::cout << name << "\teat\t";
	    if( f == Apple)	std::cout << "an Apple\n";
	    else		std::cout << "an Orange\n";
	    Sleep( 0.9);
	    c_eat.signal();
	}
    }
    
    void init(){
	c_eat.signal();
	c_eat.signal();
    }
private:
    Cond c_apple;
    Cond c_orange;
    Cond c_eat;
};


int main(){
    Plate  plate;
    Thread father ( plate, &Plate::add, std::string("father"), Apple);
    Thread mother ( plate, &Plate::add, std::string("mother"), Orange);

    Thread boy_a  ( plate, &Plate::eat, std::string("boy_a" ), Orange);
    Thread boy_b  ( plate, &Plate::eat, std::string("boy_b" ), Orange);

    Thread girl_a ( plate, &Plate::eat, std::string("girl_a"), Apple);
    Thread girl_b ( plate, &Plate::eat, std::string("girl_b"), Apple);
    
//start    
    father.start(); mother.start(); 
    boy_a.start();  boy_b.start();
    girl_a.start(); girl_b.start();

//init
    Sleep( 1);
    plate.init();
//join    
    father.join(); mother.join();
    boy_a.join();  boy_b.join();
    girl_a.join(); girl_b.join();

    
}